एपीए उद्धरण

(1999). UPSC (IES) Engineering Services Examination Papers: Solved and Unsolved in General Studies. G.K.

शिकागो स्टाइल उद्धरण

UPSC (IES) Engineering Services Examination Papers: Solved and Unsolved in General Studies. Jabalpur: G.K, 1999.

एमएलए उद्धरण

UPSC (IES) Engineering Services Examination Papers: Solved and Unsolved in General Studies. G.K, 1999.